Some of our users have noticed that the Vocera report server sometimes doesn’t seem to know about certain badges being logged into. This has to do with how Vocera logs inventory data. In order for a badge’s “last used” status to change in the Badge Last Used (BLU) report (or Devicekeeper, for those of you that use it), a user has to log in the badge and still be logged in when the badge updates its inventory record in the logs. This update occurs every 15 minutes (from when the badge is powered on).